yeah, as of a few years ago the passenger and drivers windows must let in 100% although a lot of cars still have theirs mildly tinted at the front for a bit of balance. i got pulled by the plod for my front windows (fortunately for me, they didn't know the law), and said they had to be a max of 35% and that they'd fine me if i didn't remove them in a week.
so i striped them out and the car looks stupid, so i'll probably put some lighter ones back in the front